Mandy Moore Honors World Adoption Day With Touching Post

"Without Randall, the Pearson family would not have been complete."

November is National Adoption Month. In honor of the month, we will be bringing attention to the thousands of people in foster care awaiting forever homes, as well as those who provide and advocate for them. These stories emphasize the idea that families are bound together by the love they share, rather than their biological roots.

November 9 was World Adoption Day, and to honor the holiday that celebrates adoption and families of all kinds, This is Us star Mandy Moore took to Twitter to share a very sweet tribute to her adopted TV child.

Moore, whose character, Rebecca Pearson, is the matriarch of a blended family with two biological children and one adopted African American son named Randall, noted how her fictional family would be incomplete without him. "Without Randall, there wouldn't be a Big Three," she wrote alongside a brief clip of the Pearsons getting their family photo taken. "Without Randall, the Pearson family would not have been complete."

She finished off the sweet status, above, with a heart emoji and "#ThisIsUs #WorldAdoptionDay."

The November 7 episode of This Is Us featured a look back at Rebecca and Jack's (Milo Ventimiglia) tough journey to adopt Randall, which involved one judge recusing himself from their case because he didn't support the transracial adoption.

Much like the show itself, Moore's Twitter status was appreciated by fans, many of whom shared their own experiences with adoption. Take a look at some of the moving comments below:

According to a report from PBS, the majority of American adoptions involve children adopted out of foster care. The organization notes about 135,000 children are adopted in the United States annually, and of non-stepparent adoptions, about 59 percent are from the child welfare (or foster) system. Another 26 percent of adoptions are from other countries, and 15 percent are voluntarily relinquished American babies.